1. School of Geodesy and Geomatics, Wuhan University, No. 129, Luoyu Road, Hongshan District, Wuhan 430079, China, cjxu@sgg.whu.edu.cn
2. Department of Land Surveying and Geo‐informatics, The Hong Kong Polytechnic University, No. 181, Chatham Road South, Hung Hom, Kowloon, Hong Kong, China, wenbin.xu@polyu.edu.hk
3. Institute of Geodesy, University of Stuttgart, Geschwister‐Scholl‐Str. 24D, 70174 Stuttgart, Germany
4. Earth System Science Program, The Chinese University of Hong Kong, Shatin, NT, Hong Kong 999077, China